Tektronix 213
1975
The Tektronix 213 first appeared in the Tektronix 1975 Products catalog at a price of $1200 and is a very small portable single-trace oscilloscope with 1MHz bandwidth. The 213 has rechargeable batteries built in and is capable of operating for several hours without AC power and is great for use out in the field. The most unique feature of the 213 is a built-in 3.5 digit digital multimeter (DMM) that displays the readings directly on the CRT. The oscilloscope could measure DC, AC, or even resistance over time.
 
 
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Jon Stanley